US20130136317A1 - Vein image capture device - Google Patents
Vein image capture device Download PDFInfo
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- US20130136317A1 US20130136317A1 US13/742,878 US201313742878A US2013136317A1 US 20130136317 A1 US20130136317 A1 US 20130136317A1 US 201313742878 A US201313742878 A US 201313742878A US 2013136317 A1 US2013136317 A1 US 2013136317A1
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- image capture
- capture device
- body part
- vein
- support
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- 210000003462 vein Anatomy 0.000 title claims abstract description 74
- 238000005286 illumination Methods 0.000 claims abstract description 88
- 238000000034 method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 10
- 239000011521 glass Substances 0.000 description 9
- 238000004891 communication Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 210000004204 blood vessel Anatomy 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 210000001525 retina Anatomy 0.000 description 2
- 102000001554 Hemoglobins Human genes 0.000 description 1
- 108010054147 Hemoglobins Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003743 erythrocyte Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G06K9/00885—
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/82—Protecting input, output or interconnection devices
- G06F21/83—Protecting input, output or interconnection devices input devices, e.g. keyboards, mice or controllers thereof
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/143—Sensing or illuminating at different wavelengths
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/40—Spoof detection, e.g. liveness detection
- G06V40/45—Detection of the body part being alive
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0861—Network architectures or network communication protocols for network security for authentication of entities using biometrical features, e.g. fingerprint, retina-scan
Definitions
- the present invention is related to a vein image capture device for shooting a vein pattern image.
- biometric technology With the recent development of biometric technology, provided are various types of devices for personal identification by recognizing the physical characteristics of a body part of a person by capturing, for example, the fingerprints of limbs, the retina of an eye, the face, the blood vessels, etc. of a person.
- the blood vessels of a palm or a finger, and palm prints provide a relatively large amount of personal characteristic data, they are appropriate for personal identification with reliability. Furthermore, the pattern of blood vessels (vein) is not changed throughout one's lifetime after it is determined in the womb, that is, unique throughout the world, which is appropriate for personal identification.
- an illumination device emits near-infrared light to the palm
- the near-infrared light reflected by the palm is captured by a camera provided with an image sensor (patent documents 1 and 2). Since the hemoglobin in the red blood cells absorbs the near-infrared light, the quantity of the reflected near-infrared light from the vein parts decreases when the near-infrared light is emitted to the palm. Therefore, the camera may shoot the position of the vein on the palm based on the strength level of the near-infrared light.
- vein image capture device designed as a unitary construction of an illumination device and a camera.
- the vein image capture device requests the thickness for the device to be embedded in the door.
- Patent Document 1 Japanese Laid-open Patent Publication No. 2007-249615
- Patent Document 2 Japanese Laid-open Patent Publication No. 2007-30569
- the vein image capture device includes: an illumination device which illuminates a body part of a living body; an image capture device which captures a vein pattern of the body part by receiving light reflected by the body part; and a support device which is provided between the body part and the image capture device, passes the reflected light, and supports the illumination device at the body part side.
- the image capture device is separated from the support device by a distance at which the image capture device receives the reflected light.
- FIGS. 1A and 1B are schematic diagrams of examples of the configuration of the vein image capture device according to the first embodiment
- FIG. 2 is a schematic diagram of an example of the configuration of an illumination device according to the first embodiment
- FIGS. 3A and 3B are schematic diagrams of examples of the configuration of the vein image capture device according to the second embodiment
- FIG. 4 is a schematic diagram of an example of the configuration of an illumination device according to the second embodiment
- FIGS. 5A and 5B are schematic diagrams of variation examples of the configuration of the vein image capture device according to the second embodiment.
- FIGS. 6A and 6B illustrate the shape and size of the contour pattern of the illumination device.
- FIG. 1A is a side view of the vein image capture device 100
- FIG. 1B is a front view of the vein image capture device 100
- the arrow in solid line indicates the direction of the travel of the light.
- the vein image capture device 100 is provided at, for example, the entrance of a building, and captures a vein pattern of the palm of a person to be checked for authentication such as a visitor etc.
- the vein image capture device 100 includes an image capture device 10 , an illumination device 20 , and a support device 30 for supporting the illumination device 20 .
- the image capture device 10 is, for example, a camera provided with an image sensor, and is attached to a wall surface 50 .
- the illumination device 20 has a plurality of light sources, and illuminates the palm ha of a person to be checked for authentication by emitting the near-infrared light.
- the plurality of light sources may be, for example, an LED (light emitting diode) .
- the support device 30 is, for example, a door, a window, etc., and is provided between the palm ha of a person to be checked for authentication and the image capture device 10 . At least a part of the support device 30 is formed by a transparent object such as glass which transmits the reflected light from the palm ha of the person to be checked for authentication.
- the image capture device 10 captures the vein pattern of the palm ha by receiving the reflected light which has transmitted through the support device 30 . To be more detail, the image capture device 10 captures the vein pattern of the palm ha by receiving the diffused light in the illuminated palm ha.
- the image capture device 10 is a camera having a narrow-angle lens
- a camera with a lens having the angle of view of 5.72° is used.
- a camera with a lens having the angle of view of 2.86° is used.
- the illumination device 20 is provided at the palm ha side in the support device 30 .
- the reason is described below.
- the illumination device 20 when the illumination device 20 is provided at the image capture device 10 side in the support device 30 , the illumination device 20 illuminates the palm through the support device 30 .
- the illumination device 20 when the light emitted from the illumination device 20 directly enters support device 30 , there is the possibility that the optical noise caused by the reflection of the light in the support device 30 has the influence on the captured image.
- the illumination device 20 is provided at the palm ha side in the support device 30 , the illumination device 20 illustrates the palm ha without passing through the support device 30 . In this case, since the light emitted from the illumination device 20 does not directly enter the support device 30 , the reflection of the light in the support device 30 may be suppressed.
- the support device 30 if the support device 30 is made of glass, the support device 30 reflects the light at the reflectance of about 10% when the light emitted from the illumination device 20 directly enters the support device 30 . In this case, there is the possibility that a whiteout occurs as optical noise on the image of a captured vein pattern.
- the reflectance of the light when the surface reflected light from the palm ha enters glass is about 5%. Furthermore, the reflectance of the light when the diffused light in the illuminated palm ha enters glass is lower than 5%.
- the illumination device 20 when the illumination device 20 is provided at the illumination device 20 side in the support device 30 , when the illumination device 20 is provided at the palm ha side in the support device 30 , the reflection of the light may be suppressed in the support device 30 , and the occurrence of the optical noise may be reduced.
- the vein image capture device 100 the image capture device 10 is separated from the support device 30 by the distance at which the image capture device 10 may receive light reflected from the palm ha of a person to be checked for authentication. That is, in the vein image capture device 100 , the image capture device 10 is separated from the illumination device 20 .
- a door and a window may function as the support device 30 of the illumination device 20 . That is, as compared with the vein image capture device in which the illumination device and the image capture device are incorporated as a unitary construction, the vein image capture device 100 according to the first embodiment maybe applied although the thickness of the door or window is thicker.
- the contour pattern of the illumination device 20 is circular.
- FIG. 2 is a schematic diagram of the configuration of the illumination device 20 , and an enlarged view of FIG. 1B .
- the illumination device 20 has the configuration in which, for example, a plurality of LEDs 21 are arranged on the contour pattern PT marked circularly.
- the illumination device 20 is provided in the support device 30 so that the image capture device 10 is positioned may be positioned in the area AR enclosed in the contour pattern PT.
- the palm ha is irradiated with the light emitted from the plurality of LEDs 21 .
- the light reflected from the palm ha enters the image capture device 10 through an area AR.
- the vein image capture device 100 has the illumination device 20 , the image capture device 10 , and the support device 30 which supports the illumination device 20 .
- the illumination device 20 illuminates the palm ha of a person to be checked for authentication, and the image capture device 10 captures the vein pattern of the palm ha by receiving the light reflected by the palm ha.
- the support device 30 supports the illumination device 20 at the palm ha side.
- the occurrence of the optical noise may be suppressed on the captured image of the vein pattern.
- the image capture device 10 is separated from the support device 30 by the distance at which the image capture device 10 may receive the light reflected by the palm ha.
- the image capture device 10 is separated from the illumination device 20 .
- the support device 30 is only to support the illumination device 20 , and the thickness of the support device may be thicker as compared with the case in which the support device 30 supports both image capture device and illumination device, thereby realizing a wider application of the vein image capture device.
- the distance between the support device 30 and the palm ha longer than the distance between the image capture device 10 and the support device 30 , avoided is the fluctuation of the magnification of the image of the vein pattern which is caused by different distances between the support device 30 and the palm ha each time the authentication is checked.
- the vein image capture device 100 may include a control device for synchronizing the illuminating timing for the illumination device 20 with the capturing timing of the image capture device 10 .
- the power consumption of the illumination device 20 may be reduced, and the infrared illumination time for the palm ha may be shortened.
- FIG. 3A is a side view of the vein image capture device 100 a
- FIG. 3B is a front view of the vein image capture device 100 a.
- the arrow in solid line indicates the direction of the travel of the light (same in FIG. 5A ).
- the vein image capture device 100 a includes an image capture device 10 a, an illumination device 20 a, and a support device 30 a for supporting the illumination device 20 a.
- a glass window of a car is used as the support device 30 a for supporting the illumination device 20 a.
- the glass window of a car door 60 is used as the support device 30 a.
- the image capture device 10 a is provided for a support of a parking lot, for example.
- the image capture device 10 a is provided for a support 50 a. A driver stops his or her car beside the support 50 a. As illustrated in FIG.
- the stopping position of the car is set so that the image capture device 10 a may be positioned in an area AR 2 enclosed by the contour pattern designed circularly in the illumination device 20 a.
- the driver holds his or her palm ha from inside the car up to the illumination device 20 a, thereby inputting the vein pattern to the image capture device 10 a.
- the support device 30 a supports the illumination device 20 a from inside the car, that is, at the palm ha side. Therefore, the 100 a also suppress the occurrence of the optical noise on the image of the captured vein pattern.
- the vein image capture device 100 a has a communication device for performing wireless communications between the support 50 a and the car door 60 .
- the support 50 a is provided with a radio antenna 71 a
- the car door 60 is provided with a radio switch 71 b for illumination.
- the radio switch 71 a emits radio waves.
- the radio switch 71 b receives the radio waves from the radio antenna 71 a.
- the radio switch 71 b turns on the switch of the illumination device 20 a, thereby turning on the illumination device 20 a.
- the directivity and the intensity of the radio waves are set so that the radio switch 71 b may receive the radio waves when the image capture device 10 a is positioned in the area AR 2 enclosed by the illumination device 20 arranged circularly.
- the driver is only to operate the car so that the illumination device 20 a may be at the position where the illumination device 20 a is turned on without confirming whether or not the image capture device 10 a is in the area AR 2 .
- the image capture device 10 a has a physical or electronic tracking function, and a vein pattern of the palm ha may be captured by tracking the portion where the palm ha is held up by detecting the contour pattern of the illumination device 20 a.
- the image capture device 10 may capture the contour pattern of the palm ha.
- the directivity and intensity of the radio waves from the radio antenna 71 a are set so that the radio switch 71 b may receive the corresponding radio waves in a range where the image capture device 10 a may perform tracking on the palm ha.
- the glass window of the car door 60 is inclined to the ground in many cases. Concretely, in the direction toward a ceiling 65 of the car, the glass window is inclined to the inside of the car.
- the brightness of the illumination device 20 a is designed to decrease in the direction toward the ceiling 65 of the car. In other words, in the illumination device 20 a , the closer to the palm ha, the lower the brightness becomes, which is described below concretely with reference to FIG. 4 .
- FIG. 4 is a schematic diagram, and an enlarged view of FIG. 3B .
- the broken line indicates the wiring of the LED 21 .
- the illumination device 20 a has the configuration in which a plurality of LEDs 21 are arranged on the circularly marked contour pattern PT 2 .
- the palm ha is irradiated with the light emitted from the plurality of LEDs 21 .
- the voltage of +5V is applied in parallel to each of the plurality of LEDs 21 .
- a resistor is connected to each of the plurality of LEDs 21 .
- resistors R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are connected in series to each of the LED 21 .
- R 1 through R 6 indicate the values of resistance.
- the values of resistance are set as R 1 >R 2 >R 3 >R 4 >F 5 >R 6 . With the settings, the closer to the ceiling 65 of the car, the lower the current and the brightness become.
- the closer to the palm ha the lower current passes through the LED 21 , and the lower the brightness becomes.
- the farther the LED 21 is the higher current passes, thereby increasing the brightness.
- the palm ha of the driver is evenly irradiated with light.
- the vein image capture device 100 a illustrated in FIG. 4 is provided with a communication device for performing wireless communications between the support 50 a and the car door 60 . Instead, a communication device for performing communications using signal light between the support 50 a and the car door 60 may be provided.
- FIGS. 5A and 5B illustrate an example of a vein image capture device 100 b used when a communication device for performing communications using signal light is provided.
- the vein image capture device 100 b illustrated in FIGS. 5A and 5B has the support 50 a provided with a pyroelectric sensor 81 and a signal light transmission unit 82 a, and the car door 60 is provided with a signal light reception unit 82 b.
- the pyroelectric sensor 81 is connected to the signal light transmission unit 82 a.
- the pyroelectric sensor 81 detects a mobile object which emits infrared light. Upon detection of the object, the pyroelectric sensor 81 transmits a detection signal to the signal light transmission unit 82 a. Therefore, the pyroelectric sensor 81 functions as a detection device.
- the pyroelectric sensor 81 Upon detection of a car approaching the support 50 a, the pyroelectric sensor 81 transmits a detection signal to the signal light transmission unit 82 a. Upon receipt of the detection signal, the signal light transmission unit 82 a transmits pulse light to the outside of the support 50 a. At the car door 60 , upon receipt of the pulse light transmitted from the signal light transmission unit 82 a, the signal light reception unit 82 b turns on the illumination device 20 a.
- the direction of the transmission of the pulse light from the signal light transmission unit 82 a is set so that, for example, the signal light reception unit 82 b may receive the pulse light when the image capture device 10 is located in the area AR 2 enclosed by the circularly arranged illumination devices 20 . Otherwise, when the image capture device 10 has a tracking function, the direction of the transmission of the pulse light from the signal light transmission unit 82 a is set so that the signal light reception unit 82 b may receive the pulse light in the range in which the image capture device 10 a may perform tracking on the palm ha. With the configuration, the driver is only to operate the car so that the illumination device 20 a is turned on without confirming whether or not the image capture device 10 a is located in the area AR 2 .
- the vein image capture device 100 a is provided with a glass window of a car as the support device 30 a for supporting the illumination device 20 a, and the image capture device 10 a is attached to, for example, a support of a parking lot etc.
- the support device 30 a supports the illumination device 20 a at the inside of the car, that is, on the palm ha side. With the configuration, the occurrence of optical noise may be suppressed on the image of a captured vein pattern.
- a light source for emitting near-infrared light is used as a light source of an illumination device (LED in this example), but the present invention is not limited to this application. It is obvious that a light source of am illumination device is not limited to a device which emits near-infrared light, but any device which emits light having a plurality of wavelengths may be used. Furthermore, in an illumination device having a light source which emits light of a plurality of wavelengths, the illustration timing for emitting light of each wavelength is shifted, and each illustration timing may be synchronized with the capture timing of an image capture device.
- an illumination device may be provided with a light source for emitting near-infrared light and a light source for emitting visible light
- the illustration timing of emitting the near-infrared light is synchronized with the capture timing of the image capture device
- the illustration timing of emitting the visible light is synchronized with the capture timing of the image capture device.
- the vein pattern may be captured with the timing of emitting the near-infrared light
- the palm print may be captured with the timing of emitting the visible light.
- the palm print may be used in authentication, thereby improving the authentication accuracy.
- FIGS. 6A and 6B illustrate the shape and size of the contour pattern of an illumination device.
- a contour pattern of the illumination device is not limited to the rectangular shape as illustrated in 6 A, but various shapes may be used.
- a contour pattern of an illumination device may be circular as illustrated in FIG. 6B .
- the preferable size LA of the contour pattern of the illumination device may be 10 cm through 13 cm with the size of a palm taken into account.
- a pyroelectric sensor is provided as a detection device.
- an example of providing a pyroelectric sensor is not limited to the application above.
- a pyroelectric sensor is vertical for the wall surface 50 , and when the pyroelectric sensor detects that a visitor approaches the device, the illumination device 20 may be turned on.
- the image capture device is provided with a photodetector device such as an optical sensor etc.
- the illumination device emits light to the palm
- the image capture device automatically start capturing an image when the photodetector device receives the light reflected by the palm.
- the image capture device corrects an image of the captured vein pattern of the palm based on the size of the captured contour pattern of the illumination device.
- the image capture device may calculate the distance between the support device and the image capture device based on the size of the image of the captured contour pattern of the illumination device, and correct the image of the captured vein pattern of the palm.
- the image of the vein pattern may be corrected in an appropriate size.
- the vein pattern of a palm is used in authentication.
- the living body part used in authentication is not limited to a palm.
- a device which uses a vein pattern of any other living body part such as the retina of an eye may use the method described above.
- the support device may be only to support the illumination device. Therefore, as compared with the case in which the support device supports both image capture device and illumination device, the thickness of the support device may be reduced, and various attachment conditions are satisfied.
Abstract
Description
- This application is a continuation of International application No. PCT/JP2010/062355, filed on Jul. 22, 2010, the entire contents of which are incorporated herein by reference.
- The present invention is related to a vein image capture device for shooting a vein pattern image.
- With the recent development of biometric technology, provided are various types of devices for personal identification by recognizing the physical characteristics of a body part of a person by capturing, for example, the fingerprints of limbs, the retina of an eye, the face, the blood vessels, etc. of a person.
- Especially, since the blood vessels of a palm or a finger, and palm prints provide a relatively large amount of personal characteristic data, they are appropriate for personal identification with reliability. Furthermore, the pattern of blood vessels (vein) is not changed throughout one's lifetime after it is determined in the womb, that is, unique throughout the world, which is appropriate for personal identification.
- As a concrete method of capturing a vein image, an illumination device emits near-infrared light to the palm, the near-infrared light reflected by the palm is captured by a camera provided with an image sensor (
patent documents 1 and 2). Since the hemoglobin in the red blood cells absorbs the near-infrared light, the quantity of the reflected near-infrared light from the vein parts decreases when the near-infrared light is emitted to the palm. Therefore, the camera may shoot the position of the vein on the palm based on the strength level of the near-infrared light. - There may be restrictions on the installation of a vein image capture device designed as a unitary construction of an illumination device and a camera. For example, when the vein image capture device is to be installed on the door of an apartment, the vein image capture device requests the thickness for the device to be embedded in the door.
- According to an aspect of the vein image capture device of the present invention, the vein image capture device includes: an illumination device which illuminates a body part of a living body; an image capture device which captures a vein pattern of the body part by receiving light reflected by the body part; and a support device which is provided between the body part and the image capture device, passes the reflected light, and supports the illumination device at the body part side. The image capture device is separated from the support device by a distance at which the image capture device receives the reflected light.
- The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention.
-
FIGS. 1A and 1B are schematic diagrams of examples of the configuration of the vein image capture device according to the first embodiment; -
FIG. 2 is a schematic diagram of an example of the configuration of an illumination device according to the first embodiment; -
FIGS. 3A and 3B are schematic diagrams of examples of the configuration of the vein image capture device according to the second embodiment; -
FIG. 4 is a schematic diagram of an example of the configuration of an illumination device according to the second embodiment; -
FIGS. 5A and 5B are schematic diagrams of variation examples of the configuration of the vein image capture device according to the second embodiment; and -
FIGS. 6A and 6B illustrate the shape and size of the contour pattern of the illumination device. - An example of the embodiments is described below with reference to the attached drawings.
- First, an example of the configuration of a vein
image capture device 100 is described with reference toFIGS. 1A and 1B .FIG. 1A is a side view of the veinimage capture device 100, andFIG. 1B is a front view of the veinimage capture device 100. InFIG. 1A , the arrow in solid line indicates the direction of the travel of the light. - The vein
image capture device 100 is provided at, for example, the entrance of a building, and captures a vein pattern of the palm of a person to be checked for authentication such as a visitor etc. - As illustrated in
FIG. 1A , the veinimage capture device 100 includes animage capture device 10, anillumination device 20, and asupport device 30 for supporting theillumination device 20. - The
image capture device 10 is, for example, a camera provided with an image sensor, and is attached to awall surface 50. Theillumination device 20 has a plurality of light sources, and illuminates the palm ha of a person to be checked for authentication by emitting the near-infrared light. The plurality of light sources may be, for example, an LED (light emitting diode) . Thesupport device 30 is, for example, a door, a window, etc., and is provided between the palm ha of a person to be checked for authentication and theimage capture device 10. At least a part of thesupport device 30 is formed by a transparent object such as glass which transmits the reflected light from the palm ha of the person to be checked for authentication. Theimage capture device 10 captures the vein pattern of the palm ha by receiving the reflected light which has transmitted through thesupport device 30. To be more detail, theimage capture device 10 captures the vein pattern of the palm ha by receiving the diffused light in the illuminated palm ha. - It is preferable that the
image capture device 10 is a camera having a narrow-angle lens, The longer the distance between the device and the object to be shot, the narrower the angle of view is. For example, when the vein pattern of a palm of 15 cm is captured, and when the distance between theimage capture device 10 and the palm ha is 1.5 m, a camera with a lens having the angle of view of 5.72° is used. When the distance between theimage capture device 10 and the palm ha is 3 m, a camera with a lens having the angle of view of 2.86° is used. In addition, when the distance between theimage capture device 10 and the palm ha is 5 cm as in the case of an ATM (automated teller machine) , a camera with a lens having the angle of view of about 112.62° is used. Thus, the longer the distance from the object to be shot, the narrower the angle of view of the lens becomes for a camera as theimage capture device 10, thereby allowing the light reflected by the palm ha to easily enter theimage capture device 10. - The
illumination device 20 is provided at the palm ha side in thesupport device 30. The reason is described below. For example, when theillumination device 20 is provided at theimage capture device 10 side in thesupport device 30, theillumination device 20 illuminates the palm through thesupport device 30. Thus, when the light emitted from theillumination device 20 directly enterssupport device 30, there is the possibility that the optical noise caused by the reflection of the light in thesupport device 30 has the influence on the captured image. On the other hand, when theillumination device 20 is provided at the palm ha side in thesupport device 30, theillumination device 20 illustrates the palm ha without passing through thesupport device 30. In this case, since the light emitted from theillumination device 20 does not directly enter thesupport device 30, the reflection of the light in thesupport device 30 may be suppressed. - For example, if the
support device 30 is made of glass, thesupport device 30 reflects the light at the reflectance of about 10% when the light emitted from theillumination device 20 directly enters thesupport device 30. In this case, there is the possibility that a whiteout occurs as optical noise on the image of a captured vein pattern. On the other hand, the reflectance of the light when the surface reflected light from the palm ha enters glass is about 5%. Furthermore, the reflectance of the light when the diffused light in the illuminated palm ha enters glass is lower than 5%. - That is, as compared with the case in which the
illumination device 20 is provided at theillumination device 20 side in thesupport device 30, when theillumination device 20 is provided at the palm ha side in thesupport device 30, the reflection of the light may be suppressed in thesupport device 30, and the occurrence of the optical noise may be reduced. - In addition, in the vein
image capture device 100, theimage capture device 10 is separated from thesupport device 30 by the distance at which theimage capture device 10 may receive light reflected from the palm ha of a person to be checked for authentication. That is, in the veinimage capture device 100, theimage capture device 10 is separated from theillumination device 20. With the arrangement, for example, a door and a window may function as thesupport device 30 of theillumination device 20. That is, as compared with the vein image capture device in which the illumination device and the image capture device are incorporated as a unitary construction, the veinimage capture device 100 according to the first embodiment maybe applied although the thickness of the door or window is thicker. - Described below is the configuration of the
illumination device 20. As illustrated inFIG. 1B , the contour pattern of theillumination device 20 is circular. - The
illumination device 20 is described below with reference toFIG. 2 .FIG. 2 is a schematic diagram of the configuration of theillumination device 20, and an enlarged view ofFIG. 1B . As illustrated inFIG. 2 , theillumination device 20 has the configuration in which, for example, a plurality ofLEDs 21 are arranged on the contour pattern PT marked circularly. Theillumination device 20 is provided in thesupport device 30 so that theimage capture device 10 is positioned may be positioned in the area AR enclosed in the contour pattern PT. The palm ha is irradiated with the light emitted from the plurality ofLEDs 21. The light reflected from the palm ha enters theimage capture device 10 through an area AR. - As described above, the vein
image capture device 100 according to the first embodiment has theillumination device 20, theimage capture device 10, and thesupport device 30 which supports theillumination device 20. Theillumination device 20 illuminates the palm ha of a person to be checked for authentication, and theimage capture device 10 captures the vein pattern of the palm ha by receiving the light reflected by the palm ha. At this point, thesupport device 30 supports theillumination device 20 at the palm ha side. Thus, the occurrence of the optical noise may be suppressed on the captured image of the vein pattern. Also in the veinimage capture device 100 according to the first embodiment, theimage capture device 10 is separated from thesupport device 30 by the distance at which theimage capture device 10 may receive the light reflected by the palm ha. That is, theimage capture device 10 is separated from theillumination device 20. Thus, thesupport device 30 is only to support theillumination device 20, and the thickness of the support device may be thicker as compared with the case in which thesupport device 30 supports both image capture device and illumination device, thereby realizing a wider application of the vein image capture device. In addition, by keeping the distance between thesupport device 30 and the palm ha longer than the distance between theimage capture device 10 and thesupport device 30, avoided is the fluctuation of the magnification of the image of the vein pattern which is caused by different distances between thesupport device 30 and the palm ha each time the authentication is checked. - It is not always requested that the
illumination device 20 is kept turned on. Instead, the veinimage capture device 100 may include a control device for synchronizing the illuminating timing for theillumination device 20 with the capturing timing of theimage capture device 10. With the configuration, the power consumption of theillumination device 20 may be reduced, and the infrared illumination time for the palm ha may be shortened. - Next, an example of the configuration of a vein
image capture device 100 a is described with reference toFIGS. 3A and 3B .FIG. 3A is a side view of the veinimage capture device 100 a, andFIG. 3B is a front view of the veinimage capture device 100 a. InFIG. 3A , the arrow in solid line indicates the direction of the travel of the light (same inFIG. 5A ). - As illustrated in
FIG. 3A , the veinimage capture device 100 a includes animage capture device 10 a, anillumination device 20 a, and asupport device 30 a for supporting theillumination device 20 a. In the veinimage capture device 100 a according to the second embodiment, a glass window of a car is used as thesupport device 30 a for supporting theillumination device 20 a. In the example illustrated inFIG. 3A , the glass window of acar door 60 is used as thesupport device 30 a. Theimage capture device 10 a is provided for a support of a parking lot, for example. In the example illustrated inFIG. 3A , theimage capture device 10 a is provided for asupport 50 a. A driver stops his or her car beside thesupport 50 a. As illustrated inFIG. 3B , the stopping position of the car is set so that theimage capture device 10 a may be positioned in an area AR2 enclosed by the contour pattern designed circularly in theillumination device 20 a. After stopping the car, the driver holds his or her palm ha from inside the car up to theillumination device 20 a, thereby inputting the vein pattern to theimage capture device 10 a. - In the vein
image capture device 100 a according to the second embodiment, as with the veinimage capture device 100 according to the first embodiment, thesupport device 30 a supports theillumination device 20 a from inside the car, that is, at the palm ha side. Therefore, the 100 a also suppress the occurrence of the optical noise on the image of the captured vein pattern. - In addition, the vein
image capture device 100 a has a communication device for performing wireless communications between thesupport 50 a and thecar door 60. Concretely, as illustrated inFIG. 3A , thesupport 50 a is provided with aradio antenna 71 a, and thecar door 60 is provided with aradio switch 71 b for illumination. Theradio switch 71 a emits radio waves. When the car approaches thesupport 50 a, theradio switch 71 b receives the radio waves from theradio antenna 71 a. Upon receipt of the radio waves, theradio switch 71 b turns on the switch of theillumination device 20 a, thereby turning on theillumination device 20 a. The directivity and the intensity of the radio waves are set so that theradio switch 71 b may receive the radio waves when theimage capture device 10 a is positioned in the area AR2 enclosed by theillumination device 20 arranged circularly. With the configuration, the driver is only to operate the car so that theillumination device 20 a may be at the position where theillumination device 20 a is turned on without confirming whether or not theimage capture device 10 a is in the area AR2. - It is assumed that the
image capture device 10 a has a physical or electronic tracking function, and a vein pattern of the palm ha may be captured by tracking the portion where the palm ha is held up by detecting the contour pattern of theillumination device 20 a. With the configuration, although the position of the area AR2 enclosed by the illumination device and the position of theimage capture device 10 a are somewhat shifted from each other due to the shift of the stopping position of the car, theimage capture device 10 may capture the contour pattern of the palm ha. In this case, the directivity and intensity of the radio waves from theradio antenna 71 a are set so that theradio switch 71 b may receive the corresponding radio waves in a range where theimage capture device 10 a may perform tracking on the palm ha. - Furthermore, the glass window of the
car door 60 is inclined to the ground in many cases. Concretely, in the direction toward aceiling 65 of the car, the glass window is inclined to the inside of the car. To evenly illuminate the palm ha of the driver, the brightness of theillumination device 20 a is designed to decrease in the direction toward theceiling 65 of the car. In other words, in theillumination device 20 a, the closer to the palm ha, the lower the brightness becomes, which is described below concretely with reference toFIG. 4 . -
FIG. 4 is a schematic diagram, and an enlarged view ofFIG. 3B . InFIG. 4 , the broken line indicates the wiring of theLED 21. - As illustrated in
FIG. 4 , as with theillumination device 20 according to the first embodiment, theillumination device 20 a has the configuration in which a plurality ofLEDs 21 are arranged on the circularly marked contour pattern PT2. The palm ha is irradiated with the light emitted from the plurality ofLEDs 21. - As illustrated in
FIG. 4 , the voltage of +5V is applied in parallel to each of the plurality ofLEDs 21. Then, a resistor is connected to each of the plurality ofLEDs 21. Concretely, sequentially from the ceiling of the car, resistors R1, R2, R3, R4, R5, and R6 are connected in series to each of theLED 21. Assume that the R1 through R6 indicate the values of resistance. The values of resistance are set as R1>R2>R3>R4>F5>R6. With the settings, the closer to theceiling 65 of the car, the lower the current and the brightness become. That is, the closer to the palm ha, the lower current passes through theLED 21, and the lower the brightness becomes. On the other hand, the farther theLED 21 is, the higher current passes, thereby increasing the brightness. Thus, the palm ha of the driver is evenly irradiated with light. - The vein
image capture device 100 a illustrated inFIG. 4 is provided with a communication device for performing wireless communications between thesupport 50 a and thecar door 60. Instead, a communication device for performing communications using signal light between thesupport 50 a and thecar door 60 may be provided.FIGS. 5A and 5B illustrate an example of a veinimage capture device 100 b used when a communication device for performing communications using signal light is provided. - The vein
image capture device 100 b illustrated inFIGS. 5A and 5B has thesupport 50 a provided with apyroelectric sensor 81 and a signallight transmission unit 82 a, and thecar door 60 is provided with a signallight reception unit 82 b. Thepyroelectric sensor 81 is connected to the signallight transmission unit 82 a. Thepyroelectric sensor 81 detects a mobile object which emits infrared light. Upon detection of the object, thepyroelectric sensor 81 transmits a detection signal to the signallight transmission unit 82 a. Therefore, thepyroelectric sensor 81 functions as a detection device. Upon detection of a car approaching thesupport 50 a, thepyroelectric sensor 81 transmits a detection signal to the signallight transmission unit 82 a. Upon receipt of the detection signal, the signallight transmission unit 82 a transmits pulse light to the outside of thesupport 50 a. At thecar door 60, upon receipt of the pulse light transmitted from the signallight transmission unit 82 a, the signallight reception unit 82 b turns on theillumination device 20 a. - The direction of the transmission of the pulse light from the signal
light transmission unit 82 a is set so that, for example, the signallight reception unit 82 b may receive the pulse light when theimage capture device 10 is located in the area AR2 enclosed by the circularly arrangedillumination devices 20. Otherwise, when theimage capture device 10 has a tracking function, the direction of the transmission of the pulse light from the signallight transmission unit 82 a is set so that the signallight reception unit 82 b may receive the pulse light in the range in which theimage capture device 10 a may perform tracking on the palm ha. With the configuration, the driver is only to operate the car so that theillumination device 20 a is turned on without confirming whether or not theimage capture device 10 a is located in the area AR2. - As described above, the vein
image capture device 100 a according to the second embodiment is provided with a glass window of a car as thesupport device 30 a for supporting theillumination device 20 a, and theimage capture device 10 a is attached to, for example, a support of a parking lot etc. As with the first embodiment, thesupport device 30 a supports theillumination device 20 a at the inside of the car, that is, on the palm ha side. With the configuration, the occurrence of optical noise may be suppressed on the image of a captured vein pattern. - Described next is a variation example of each embodiment.
- In the vein image capture device according to each of the embodiments above, a light source for emitting near-infrared light is used as a light source of an illumination device (LED in this example), but the present invention is not limited to this application. It is obvious that a light source of am illumination device is not limited to a device which emits near-infrared light, but any device which emits light having a plurality of wavelengths may be used. Furthermore, in an illumination device having a light source which emits light of a plurality of wavelengths, the illustration timing for emitting light of each wavelength is shifted, and each illustration timing may be synchronized with the capture timing of an image capture device. For example, an illumination device may be provided with a light source for emitting near-infrared light and a light source for emitting visible light, the illustration timing of emitting the near-infrared light is synchronized with the capture timing of the image capture device, and the illustration timing of emitting the visible light is synchronized with the capture timing of the image capture device. With the configuration, the vein pattern may be captured with the timing of emitting the near-infrared light, and the palm print may be captured with the timing of emitting the visible light. Thus, in addition to the vein pattern of the palm, the palm print may be used in authentication, thereby improving the authentication accuracy.
-
FIGS. 6A and 6B illustrate the shape and size of the contour pattern of an illumination device. A contour pattern of the illumination device is not limited to the rectangular shape as illustrated in 6A, but various shapes may be used. For example, it is obvious that a contour pattern of an illumination device may be circular as illustrated inFIG. 6B . The preferable size LA of the contour pattern of the illumination device may be 10 cm through 13 cm with the size of a palm taken into account. - In the above-mentioned example of the vein image capture device according to the second embodiment, a pyroelectric sensor is provided as a detection device. However, an example of providing a pyroelectric sensor is not limited to the application above. Also in the vein image capture device according to the first embodiment, a pyroelectric sensor is vertical for the
wall surface 50, and when the pyroelectric sensor detects that a visitor approaches the device, theillumination device 20 may be turned on. - It is also preferable that, in the vein image capture device according to each of the above-mentioned embodiments, the image capture device is provided with a photodetector device such as an optical sensor etc., the illumination device emits light to the palm, and the image capture device automatically start capturing an image when the photodetector device receives the light reflected by the palm.
- It is also preferable in the vein image capture device according to each of the above-mentioned embodiments that the image capture device corrects an image of the captured vein pattern of the palm based on the size of the captured contour pattern of the illumination device. Concretely, the image capture device may calculate the distance between the support device and the image capture device based on the size of the image of the captured contour pattern of the illumination device, and correct the image of the captured vein pattern of the palm. Thus, the image of the vein pattern may be corrected in an appropriate size.
- Furthermore, in each of the above-mentioned embodiments, it is assumed that the vein pattern of a palm is used in authentication. However, it is obvious that the living body part used in authentication is not limited to a palm. For example, it is obvious that a device which uses a vein pattern of any other living body part such as the retina of an eye may use the method described above.
- The embodiment of the present invention is not limited to the examples according to the embodiments above, but any variations are accepted within the gist of the present invention or the scope of the concept of the present invention described in the claims for the patent and the entire specification thereof.
- According to the present embodiment, the support device may be only to support the illumination device. Therefore, as compared with the case in which the support device supports both image capture device and illumination device, the thickness of the support device may be reduced, and various attachment conditions are satisfied.
- All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
Claims (8)
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PCT/JP2010/062355 WO2012011181A1 (en) | 2010-07-22 | 2010-07-22 | Vein image capturing device |
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PCT/JP2010/062355 Continuation WO2012011181A1 (en) | 2010-07-22 | 2010-07-22 | Vein image capturing device |
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US8923573B2 US8923573B2 (en) | 2014-12-30 |
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JP5814920B2 (en) | 2015-11-17 |
US8923573B2 (en) | 2014-12-30 |
JPWO2012011181A1 (en) | 2013-09-09 |
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